Shift point adaptation method for a vehicle powertrain
AssigneeFord Global Technologies, LLC
InventorsConor Edward Sullivan, Markian Oleh Diakiw, Kurt Howard Nickerson, Thaddeus Hill, Cory Benson Laroche, Donald Gerald Levens
Life of this patent
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Abstract
A vehicle includes an engine, a transmission, and a controller. The engine is configured to generate power to propel the vehicle. The transmission has gears and clutches configured to shift between the gears. The controller is programmed to operate the clutches during wide-open throttle events to upshift the gears at shift points corresponding to engine speeds. The controller is further programmed to adapt the shift points by increasing the shift points over a series of the wide-open throttle events from initial values to mature values.
Claims20
A vehicle comprising:
- an engine configured to generate power to propel the vehicle;
- a step-ratio transmission having (i) a plurality of gears and (ii) a plurality of clutches configured to shift between the gears;
- an accelerator pedal;
- and
- a controller programmed to
- operate the plurality of clutches during acceleration events to upshift the plurality of gears at shift points corresponding to engine speeds,
- adapt the shift points via increasing the shift points over a subset of the acceleration events from initial values toward mature values, wherein the subset of the acceleration events corresponds to acceleration events where the accelerator pedal is fully depressed, and
- (i) adjust a hydraulic pressure applied to each clutch of the plurality of clutches during the acceleration events to drive engagement times of each clutch toward desired values and (ii) adapt the shift points in response to the adaptation of the clutches.
A vehicle comprising:
- an engine configured to generate power to propel the vehicle;
- a transmission having (i) gears and (ii) clutches configured to shift between the gears;
- and
- a controller programmed to
- operate the clutches during wide-open throttle events to upshift the gears at shift points corresponding to engine speeds,
- adjust a hydraulic pressure applied to each clutch over a series of the wide-open throttle events to drive engagement times of each clutch toward desired values, and
- adapt the shift points by increasing the shift points over the series of the wide-open throttle events from initial values to mature values in response to adjustments in the hydraulic pressure.
A vehicle comprising:
- an engine configured to generate power to propel the vehicle;
- a transmission having (i) gears and (ii) clutches configured to shift between the gears;
- and
- a controller programmed to
- operate the clutches during wide-open throttle events to upshift the gears at shift points corresponding to engine speeds,
- adapt the shift points by increasing the shift points over a series of the wide-open throttle events from initial values to mature values, and
- in response to a difference in shift points of adjacent gears exceeding a threshold during the adaptation of the shift points, increase the shift point of at least one of the adjacent gears such that the difference is less than the threshold.
Dependencies are inferred from the claim text.